Feeding potential and survival of predator, Chrysoperla carnea on nymphal population of greenhouse whitefly, Trialeurodes vaporarium were studied in lab conditions. Daily consumption rate of larval different stages of green lacewing on pest nymphs was 16.04±1.74, 21.5±2.56 & 22.3±1.92 for 1st instar, 2nd instar and 3rd instarrespectively and predator consumpted 215 different stsge nymphs of greenhouse whitefly totally. Survival percent reduced from egg(85%) to 3rd instar(4%) so that not convert to pupariom stage anyone and died. So in spite of enough population of pest, the predator could not complete it, s development.